Drive-chain.



W. M. BUTLER.

DRIVE CHAIN.

APPLICATION FILED MAR. 17, 1908.

913,618, Patented Feb. 23, 1909.

, WmMBaZZer 3W xrTEn STATES PATENT oFEroE. I

WILLIAM M. BUTLER, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE WHITNEY MANU- FACTURING COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION.

DRIVE-CHAIN.

Specification of Letters Patent.

Patented Feb. 23, 1909.

Application filed March 17, 1908. Serial No. 421,678.

. To all whom it may concern:

Be it known that I, WILLIAM M. BUTLER, a citizen of the United States of America, residing at Hartford, in the county of Hartford and State of Connecticut, have invented new and useful Improvements in Drive-Chains, of which the following is a specification.

This invention relates to improvements in drive-chains and articularly to the style of chains as used on icycles or motor cycles.

The objects of my present invention are to I construct a chain in which the pins or pivot portions are securely and firmly retained in the link or block part of the chain and against any possible danger of rotation or longitudinal movement; a further object being to so construct the chain that the ends of the pins or pivot portions thereof will notproject to any a preciable extent beyond the outer surface 0 the links, whereby a chain can be constructed for'use in spaces that are very narrow and where the projecting ends of the pins would be an objection, as will more fully appear in the body of the specification and particularly pointed out in the claims.

In the drawings forming part of this application,'l3igure 1 is a detail View showlng the manner of roughening or indenting the she uldered end of the pin before assembling the same in the opening in the side plate or block. Fig. 2 shows the manner of securing the pin to the link after assembling, the end of the pin being substantially flush with the outer surface of the link.

Referring to the drawings in detail, a desi nates the link or block part of the chain in t re several views; I) the pin in Figs. 1 and 2, n 'whlch the shouldered portion a is roughe'ned or indented by any suitable or well known means. The shouldered and roughened or indented portion a of the pin is so formed that the rid es and cavities do not extend in a longitu inal direction whereby when the metal of the link is forced laterally,

by means of a press, against the roughened shouldered portion 0 of the pin, as shown by the annular ring (1, the in is effectually retained against lateral withdrawal, as well as any rotary movement; The an ularly disposed ridges e and the cups f wil therefore prevent longitudinal withdrawal of the pin since, as stated, the metal of the link is firmly forced against the shouldered portion. This construction enables me to make. theend g of the pin substantially flush with the outer surface 71, of the links and permitting the length of the pin, and consequently the width of the chain,-to be very much decreased, which is, not possible with the usual or ordinary constructions now in use. F

My invention, as described above, in connection with Figs. 1 and 2, therefore effectively and cheaply accomplishes the objects and purposes set forth in the statement of' the invention.

What I claim, is i 1. The combination with the link or block of a drive-chain, of apinfthe reduced portion of which is indented or roughened,

is locked against rotary and longitudinal-- movement and the end of the pin and outer surface'of the link are flush.

VWILLIAM M. BUTLER. Witnesses: I

JAS. W. GREEN, W. W. TOTMAN. 

